Sea to Summit Ultra-Sil Nylon Stuff Sack Set

The Sea to Summit Ultra-Sil Stuff Sack Set is an ultralight pack-organization system made from bluesign-approved Ultra-Sil 30D nylon with a C0 non-PFAS DWR finish and a 2000 mm hydrostatic head. Hypalon pull-tabs on the drawcord and throat make opening and closing fast even with gloved or wet hands. Two size sets are available: a 3/5/8L set weighing 76 g and a 5/8/13L set weighing 100 g.

Ultralight Without Sacrificing Durability

Ultra-Sil 30D nylon uses CORDURA yarns to deliver tear resistance well above what standard ultralight fabrics offer at the same weight. Double-stitched and reinforced stress points at the drawcord throat and base handle extend the life of the sack through the repeated stuffing and pulling that pack organization demands. At 76 g for the three-sack 3/5/8L set and 100 g for the three-sack 5/8/13L set, the weight penalty for carrying a full set is negligible against the organizational benefit.

Water-Resistant Fabric Keeps Gear Dry in Light Conditions

The C0 non-PFAS DWR finish on the outer face of the Ultra-Sil 30D nylon sheds light moisture and trail splash without relying on PFAS chemistry. The fabric's 2000 mm hydrostatic head adds a further margin against incidental water contact. These sacks are not waterproof (the seams are not tape-sealed and the top uses a drawcord rather than a roll-top closure), so gear that must stay completely dry in sustained rain or submersion needs a sealed dry bag instead.

Slippery Shell Makes Pack Loading Faster

The siliconized Ultra-Sil fabric has a low-friction outer surface that lets each sack slide in and out of a pack's main compartment or pockets without snagging on other gear. A reinforced pull handle at the base gives a secure grip point for extracting a sack that's been buried under other kit, so there's no need to dig or unpack to reach a specific sack.

Features

• bluesign-approved Ultra-Sil 30D nylon: CORDURA-yarn construction with a 2000 mm hydrostatic head
• C0 non-PFAS DWR finish: water-resistant outer face without PFAS chemistry
• Hypalon pull-tabs: durable tabs on both the drawcord and the tear-proof throat for easy one-handed operation
• Reinforced base pull handle: secure grip point for sliding sacks in and out of a loaded pack
• Double-stitched stress points: reinforced at the throat and handle for long-term durability

Specifications

Who This Is For and Isn't

The Sea to Summit Ultra-Sil Stuff Sack Set suits backpackers, overlanders, and frequent travelers who want a lightweight system for organizing clothing, electronics, or camp gear inside a pack or bag. The low-friction shell and base handle make the sacks especially practical when loading and unloading a fully packed bag repeatedly.

These sacks are not waterproof: the seams are not tape-sealed and the drawcord top does not seal like a roll-top closure, so water can enter in sustained rain or submersion. Gear that must stay completely dry requires a sealed dry bag. The siliconized fabric cannot be printed or customized.

Common Questions

Are the Ultra-Sil Stuff Sacks waterproof?

The Sea to Summit Ultra-Sil Stuff Sacks are water-resistant, not waterproof. The Ultra-Sil 30D nylon fabric carries a 2000 mm hydrostatic head and a non-PFAS DWR finish that sheds light moisture, but the seams are not tape-sealed and the drawcord top does not form a watertight seal, so water can enter during sustained rain or submersion. Gear requiring full waterproof protection needs a sealed dry bag.

What is the best use for the Ultra-Sil Stuff Sack Set?

The Sea to Summit Ultra-Sil Stuff Sack Set is designed for internal pack organization: sorting clothing, camp gear, or travel items into separate sacks so they are easy to locate and retrieve. The low-friction shell and base pull handle make loading and unloading a packed bag faster, which is especially useful for frequent travelers and backpackers who repack often.

Can the Ultra-Sil Stuff Sacks be custom printed or branded?

The Sea to Summit Ultra-Sil Stuff Sacks cannot be printed on. The siliconized nylon fabric does not accept printing of any kind, so custom branding or logo decoration is not possible on these sacks.